Botany Optional Subject Solved Questions & Answers | GkSeries

76 The water potential and osmotic potential of pure water are
1 100 and zero
2 zero and zero
3 100 and 100
4 zero and 100

Answer: zero and zero
77 Rate of transpiration can be measured by
1 Ganong's potometer
2 auxanometcr
3 respirometer
4 porometer

Answer: Ganong's potometer
78 Stomata open at night in
1 CAM plants
2 C3 plants
3 C4 plants
4 succulent plants

Answer: CAM plants
79 The most abundant element present in plant is
1 nitrogen
2 manganese
3 carbon
4 iron

Answer: carbon
80 In N2-fixation process, nitrite is converted to nitrate by
1 Nitrobacter
2 Azotobacter
3 Nitrosomonas
4 Azospirillum

Answer: Nitrobacter
81 In photosynthesis, reaction centre of pigment system-I is
1 P680
2 P690
3 P7OO
4 P720

Answer: P7OO
82 Release of water from plants as water droplet is known as
1 root pressure
2 transpiration
3 osmotic pressure
4 guttation

Answer: guttation
83 The end products of aerobic respiration are
1 sugar and oxygen
2 water and energy
3 C02, H20 and energy
4 C02 and energy

Answer: C02, H20 and energy
84 Apical dominance can be overcome by the application of
1 auxin
2 gibberellin
3 cytokinin
4 florigen

Answer: cytokinin
85 Which of the following is a long-day plant?
1 Glycine max
2 Spinach
3 Mirabilis jalapa
4 Soya bean

Answer: Spinach
86 Ecological succession on the sandy soil is called
1 psammosere
2 xerosere
3 hydrosere
4 holosere

Answer: psammosere
87 Mendel's second law is the law of
1 independent assortment
2 segregation
3 dominance
4 polygenic inheritance

Answer: independent assortment
88 The genotype of a plant showing a dominant phenotype can be determined by
1 backcross
2 testcross
3 dihybrid cross
4 pedigree analysis

Answer: testcross
89 Down's syndrome is due to
1 linkage
2 sex-linked inheritance
3 crossing-over
4 non-disjunction of chromosome

Answer: non-disjunction of chromosome
90 Chemical theory of origin of life was given by
1 Stanley Miller
2 Spallazani
3 Oparin and Haldane
4 Louis Pasteur

Answer: Oparin and Haldane